/********************************** (C) COPYRIGHT *******************************
 * File Name          : main.c
 * Author             : WCH
 * Version            : V1.0.0
 * Date               : 2019/10/15
 * Description        : Main program body.
 *********************************************************************************
 * Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
 * Attention: This software (modified or not) and binary are used for 
 * microcontroller manufactured by Nanjing Qinheng Microelectronics.
 *******************************************************************************/

/*
 *@Note
 *Timer synchronization mode:
 *TIM1_CH1(PA8)
 *This example demonstrates 4 timer synchronization modes.
 *
 *Note: View TIM1->CNT and TIM2->CNT observations in debug mode.
 *
*/

#include "debug.h"


/*********************************************************************
 * @fn      TIM_TimSynchroMode1_Init
 *
 * @brief   Using TIM2 as prescaler for TIM1.
 *
 * @return  none
 */
void TIM_TimSynchroMode1_Init( void )
{
    RCC_APB2PeriphClockCmd( RCC_APB2Periph_TIM1, ENABLE );
    RCC_APB1PeriphClockCmd( RCC_APB1Periph_TIM2, ENABLE );

    TIM_CounterModeConfig( TIM1, TIM_CounterMode_Up );
    TIM_CounterModeConfig( TIM2, TIM_CounterMode_Up );
    TIM_SetAutoreload( TIM1, 0x3E8 );
    TIM_PrescalerConfig( TIM1, 48000 - 1, TIM_PSCReloadMode_Immediate );
    TIM_SelectOutputTrigger( TIM1, TIM_TRGOSource_Update );
    TIM_ITRxExternalClockConfig( TIM2, TIM_TS_ITR0 );
    TIM_SelectSlaveMode( TIM2, TIM_SlaveMode_External1 );

    TIM_Cmd( TIM1, ENABLE );
    TIM_Cmd( TIM2, ENABLE );
}

/*********************************************************************
 * @fn      TIM_TimSynchroMode2_Init
 *
 * @brief   Using TIM2 to use TIM1.
 *
 * @return  none
 */
void TIM_TimSynchroMode2_Init( void )
{
    TIM_OCInitTypeDef TIM_OCInitStructure = {0};

    RCC_APB2PeriphClockCmd( RCC_APB2Periph_TIM1, ENABLE );
    RCC_APB1PeriphClockCmd( RCC_APB1Periph_TIM2, ENABLE );

    TIM_CounterModeConfig( TIM1, TIM_CounterMode_Up );
    TIM_CounterModeConfig( TIM2, TIM_CounterMode_Up );
    TIM_SetAutoreload( TIM1, 0x3E8 );
    TIM_PrescalerConfig( TIM1, 48000 - 1, TIM_PSCReloadMode_Immediate );

    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = 0x64;
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
    TIM_OC1Init( TIM1, &TIM_OCInitStructure );

    TIM_SelectOutputTrigger( TIM1, TIM_TRGOSource_OC1Ref );
    TIM_SelectInputTrigger( TIM2, TIM_TS_ITR0 );
    TIM_SelectSlaveMode( TIM2, TIM_SlaveMode_Gated );

    TIM_Cmd( TIM2, ENABLE );
    TIM_Cmd( TIM1, ENABLE );
}

/*********************************************************************
 * @fn      TIM_TimSynchroMode3_Init
 *
 * @brief   Using TIM2 to start TIM1.
 *
 * @return  none
 */
void TIM_TimSynchroMode3_Init( void )
{
    RCC_APB2PeriphClockCmd( RCC_APB2Periph_TIM1, ENABLE );
    RCC_APB1PeriphClockCmd( RCC_APB1Periph_TIM2, ENABLE );

    TIM_CounterModeConfig( TIM1, TIM_CounterMode_Up );
    TIM_CounterModeConfig( TIM2, TIM_CounterMode_Up );
    TIM_SetAutoreload( TIM1, 0xFFFF );
    TIM_PrescalerConfig( TIM1, 48000 - 1, TIM_PSCReloadMode_Immediate );
    TIM_SelectOutputTrigger( TIM1, TIM_TRGOSource_Update );
    TIM_SelectInputTrigger( TIM2, TIM_TS_ITR0 );
    TIM_SelectSlaveMode( TIM2, TIM_SlaveMode_Trigger );
    TIM_Cmd( TIM1, ENABLE );
}

/*********************************************************************
 * @fn      TIM_TimSynchroMode4_Init
 *
 * @brief   Starting TIM1 and TIM2 synchronously in response to an external trigger.
 *
 * @return  none
 */
void TIM_TimSynchroMode4_Init( void )
{
    GPIO_InitTypeDef GPIO_InitStructure = {0};
    TIM_ICInitTypeDef TIM_ICInitStructure = {0};

    RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA | RCC_APB2Periph_TIM1, ENABLE );
    RCC_APB1PeriphClockCmd( RCC_APB1Periph_TIM2, ENABLE );

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
    GPIO_Init( GPIOA, &GPIO_InitStructure );
    GPIO_ResetBits( GPIOA, GPIO_Pin_8 );

    TIM_CounterModeConfig( TIM1, TIM_CounterMode_Up );
    TIM_CounterModeConfig( TIM2, TIM_CounterMode_Up );
    TIM_SetAutoreload( TIM1, 0xFFFF );
    TIM_PrescalerConfig( TIM1, 48000 - 1, TIM_PSCReloadMode_Immediate );

    TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;
    TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
    TIM_ICInitStructure.TIM_ICFilter = 0x00;
    TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Falling;
    TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
    TIM_ICInit( TIM1, &TIM_ICInitStructure );

    TIM_SelectInputTrigger( TIM1, TIM_TS_TI1FP1 );
    TIM_SelectSlaveMode( TIM1, TIM_SlaveMode_Trigger );
    TIM_SelectMasterSlaveMode( TIM1, TIM_MasterSlaveMode_Enable );
    TIM_SelectOutputTrigger( TIM1, TIM_TRGOSource_Enable );
    TIM_SelectInputTrigger( TIM2, TIM_TS_ITR0 );
    TIM_SelectSlaveMode( TIM2, TIM_SlaveMode_Trigger );
}

/*********************************************************************
 * @fn      main
 *
 * @brief   Main program.
 *
 * @return  none
 */
int main( void )
{
    SystemCoreClockUpdate();
    USART_Printf_Init( 115200 );
    printf( "SystemClk:%d\r\n", SystemCoreClock );
    printf( "ChipID:%08x\r\n", DBGMCU_GetCHIPID() );
    /* Timer synchronization Mode Selection */
    TIM_TimSynchroMode1_Init();
    //	TIM_TimSynchroMode2_Init();
    //	TIM_TimSynchroMode3_Init();
    //	TIM_TimSynchroMode4_Init();

    while( 1 );
}

